Alter Sch - School District Calendar - Mission Cisd - 2025-2026

This Mission Cisd instructional academic school calendar is extremely important as it keeps you informed of Alter Sch grading periods, early dismissal dates, staff development days and holidays for the Alter Sch calendar school year 2025-2026. As a parent and or student, you will find yourself needing this information on a regular basis, so please "like" and bookmark this page in a visible location within your favorite browser. The legend for this Mission Cisd 2024-2025 calendar is at the bottom of the page. If you are browsing on your PC there is another copy of the legend in the right hand column.